Actualy it uses whichever card you were last using on OSX. Windows relies on the Bios to switch Graphics adaptops. If you switch to the 9400m in OSX then boot to Windows it will use the 9400m. The only way to then switch is to reboot to OSX and change to the 9600 and boot Winows again.

no no, mine is not the 7 hours one. mine is the 5 hours model that came out in february of 2009. and even then its not running at 5 hours, only 3 hours now. it used to run til 3.5-4 but now it goes down to 5% in 3 hours
i just switched to a mac from a pc. i dont know how. can u show me how to set the graphics from 9400m instead of both 9600gt and 9400m? i hope that will make all the diff

i already did. and btw i got the models that came out in february 2009. which claimed 5 hours, but are only performing at 3-3.5 hours. im so bummed. coz i put everything on low setting, even the screen is just at 3. 3 out of 16. my model still has the foto card insert on the left side, and the battery still hot swappable. had i known they would release new batches in july that had twice as much memry, faster RAM and way longer battery, i wouldv waited. gawds this is torture just talkin bout it.